The 12th edition, building on its strong reputation, introduces new topics, fresh insights, and sharper focus on research in psychopathology. It has been revised and enhanced in a number of ways, including a separate chapter on Eating Disorders; a separate chapter on Health Problems and Behavior; a new schizophrenia chapter; expanded coverage and explanation of research methodology; expanded coverage of mental retardation; new case studies and feature boxes, and much more.